用python脚本监控并发量

该脚本作用用于查询日志过去一分钟内的并发量，并发单位位1分钟，结果打印在标准输出中，可以配合一些软件实现日志的并发实时监控，比如zabbix。

#! /usr/local/bin/python3
import sys
import re
import datetime
import os
def generate_previous_minutes():
    format='%d/%b/%Y:%H:%M'
    return (datetime.datetime.today()-datetime.timedelta(minutes=1)).strftime(format)
def check_logs(log_path,examine_minutes):
    regex_minutes=re.compile(examine_minutes)
    minutes_count=0
    step=10*1024*1024
    with open(log_path,encoding='Latin-1') as file:
        line=file.readline()
        while line:
            time_line=line.split(' ')[3][1:]
            if time_line>=examine_minutes:
                file.seek(file.tell()-step)
                file.readline()
                break
            file.seek(file.tell()+step)
            if file.tell()>=os.path.getsize(log_path):
                file.seek(file.tell()-step)
                file.readline()
                break
            file.readline()
            line=file.readline().strip()
        for line in file:
            line=line.strip()
            words=line.split(' ')
            if(regex_minutes.search(words[3])):
                minutes_count+=1
    print(minutes_count)
def main(log_path):
    previous_minutes=generate_previous_minutes()
    print(previous_minutes)
    check_logs(log_path,previous_minutes)
if __name__ == '__main__':
    log_path=sys.argv[1]
    main(log_path)